EP1453339A1 - Procédé d'attribution de ressources radio pour une transmission de données dans un système de radiocommunication - Google Patents

Procédé d'attribution de ressources radio pour une transmission de données dans un système de radiocommunication Download PDF

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Publication number
EP1453339A1
EP1453339A1 EP03004530A EP03004530A EP1453339A1 EP 1453339 A1 EP1453339 A1 EP 1453339A1 EP 03004530 A EP03004530 A EP 03004530A EP 03004530 A EP03004530 A EP 03004530A EP 1453339 A1 EP1453339 A1 EP 1453339A1
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EP
European Patent Office
Prior art keywords
interface
subscriber
channels
packet data
participants
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03004530A
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German (de)
English (en)
Inventor
Carsten Dr. Ball
Kolio Dr. Ivanov
Robert Müllner
Franz Treml
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP03004530A priority Critical patent/EP1453339A1/fr
Priority to EP04703793A priority patent/EP1597930B1/fr
Priority to PCT/EP2004/000466 priority patent/WO2004077866A1/fr
Priority to DE502004001672T priority patent/DE502004001672D1/de
Priority to US10/541,707 priority patent/US7382745B2/en
Publication of EP1453339A1 publication Critical patent/EP1453339A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/80—Rating or billing plans; Tariff determination aspects
    • H04M15/8016—Rating or billing plans; Tariff determination aspects based on quality of service [QoS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/24—Accounting or billing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
    • H04M2215/20—Technology dependant metering
    • H04M2215/2026—Wireless network, e.g. GSM, PCS, TACS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
    • H04M2215/32—Involving wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
    • H04M2215/74—Rating aspects, e.g. rating parameters or tariff determination apects
    • H04M2215/7414—QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks

Definitions

  • Radio communication systems are used to transmit information, Voice or data, with the help of electromagnetic Waves over a radio interface, also air interface between a sending and a receiving Radio station.
  • An example of a radio communication system is the well-known GSM mobile radio system and its further development with the packet data service GPRS respectively EDGE, its architecture, for example, in B. Walke, cellular networks and their protocols, Volume 1, Teubner-Verlag Stuttgart, 1998, pages 138 to 151 and pages 295 to 311 is. It is used to transmit a subscriber signal one by a narrowband frequency range and one Time slot formed channel provided. Since one Participant signal in a channel in frequency and time from the the radio station can distinguish other subscriber signals perform a detection of the data of the subscriber signal. In newer radio communication systems, such as that UMTS system, the individual participants are beyond distinguished by different spreading codes.
  • EDGE systems are for packet-switched data transmission several, for example six physical channels that are referred to as packet data channels.
  • packet data channels For example six physical channels that are referred to as packet data channels.
  • Everyone Participants can also use several of these packet data channels occupy simultaneously (multislot).
  • One packet data flow per participant (Temporary Block Flow TBF) in time limited radio blocks that are transmitted.
  • modulation / coding schemes for error protection applied.
  • the possible modulation / coding schemes differ with regard to the division of the radio block into Payload and error protection information.
  • These radio blocks have the same modulation / coding scheme Length different payload.
  • a connection becomes a modulation / coding scheme associated with higher or lower error protection.
  • at bad radio conditions becomes a modulation / coding scheme with higher error protection and in good radio conditions Modulation / coding scheme assigned with less error protection. Since the proportion of the payload varies depending on the Modulation / coding scheme differs, differs also the data rate that can be achieved in each case.
  • a radio communication system includes for packet data transmission for example a GSM cellular network with GPRS, a variety of packet data service nodes (serving GPRS support node, SGSN) that are networked with each other and that provide access to establish a fixed data network.
  • the packet data service nodes are also connected to base station controllers (BSC).
  • BSC base station controllers
  • each Base station control in turn enables a connection to at least one base station (BTS) and takes management the radio resources of the connected base stations in front.
  • BTS base station controller
  • the base station controller includes a packet data control unit (packet Control Unit PCU).
  • a base station is a transmitter / receiver unit, which via a radio interface Establish a message connection to a mobile device can. The assignment of the individual participants to a channel for packet-switched data transmission takes place via the Packet data control unit.
  • the A to interface is a PCM30 connection with a data rate of 64 Kbit / s, which is divided into four subchannels of 16 Kbit / s each.
  • a data packet of constant length is thus transmitted per time slot on the A to interface. Since a user has a different user data rate available on the radio interface depending on the modulation / coding scheme used, a different amount of time slots is required on the A to interface for the further transmission of this data depending on the modulation / coding scheme used.
  • the invention is therefore based on the problem of a method to allocate radio resources for a packet-switched Specify data transmission, on the one hand, satisfactory Data rates guaranteed for all participants and on the other hand the existing infrastructure resources be used effectively.
  • assignments are made for a participant Resources on a first interface between a terminal and a first network node and on a second Interface between the first network node and a second Network nodes determined together. Both a data rate and transmission characteristics requested by the subscriber the first interface, as well as a context between resources to be allocated on the first interface and resources to be allocated on the second interface considered. It also takes into account which resources previously assigned to other participants are. Finally, the benefits of all participants are optimized.
  • the resources on the first interface and the second interface together be assigned and thereby the relationship between the first interface and the resources required resources required on the second interface are taken into account the benefit of all participants is optimized, on the one hand a satisfactory Data rate guaranteed for all participants and on the other hand the existing infrastructure resources are effectively occupied.
  • the Fact that pre-existing assignments of other participants are taken into account, has an advantageous effect on the computing time and processor power required for the assignment out.
  • the first interface is designed as a radio interface between a mobile terminal and a network-side radio station that forms the first network node. Packet data channels and modulation and coding schemes are assigned on the first interface. One or more time slots are assigned on the second interface, the number of assigned time slots depending on the data rate implemented on the first interface. The data rate implemented on the first interface depends on the assigned coding scheme and the transmission properties of the first interface.
  • This embodiment of the method according to the invention is suitable for the allocation of resources on the radio interface between the mobile terminal and base station and the A to interface between the base station and base station controller in a GSM / GPRS / EDGE system.
  • the elements to be assigned the packet data channels takes into account how many channels that Terminal can send or receive simultaneously. It will be used in determining the elements to be assigned the packet data channels only elements on at most as many Considered packet data channels as the number of channels, on which the terminal is sending at the same time Can receive, corresponds. This enables assignment options, that the end device cannot use anyway, right from the start discarded. This saves computing time.
  • the quotient is preferably used as the benefit of a participant from actual data rate and requested by the participant Data rate defined.
  • the benefit of all participants is then the minimum of the quotients from the actual data rate and data rate requested by the participant for all participants Are defined.
  • the benefit of all participants is preferred in Optimized in the sense that the benefit of all participants is maximum becomes. That means the smallest quotient for one Participant from actual data rate and requested by the participant Data rate is maximized. That way ensures that all participants involved are the same Get a share of the data rate they requested.
  • a minimum data rate is specified for a participant, the data transmission from and to the participant is not should fall below, it is within the scope of the invention this minimum data rate for that subscriber as Boundary condition when optimizing the benefits of all participants to consider. This ensures that this participant the minimum data rate necessary for the functioning service is required, even with high traffic receives.
  • Figure 1 shows a section of the architecture of a GSM / GPRS / EDGE system.
  • Figure 2 shows a flow chart for the allocation of resources for a new participant.
  • a radio communication system (see FIG. 1) comprises a plurality of base stations BTS, via which a radio connection can be established via a radio interface Um to a mobile terminal MS.
  • the base station BTS is connected to a base station controller BSC via an A to interface.
  • the base station controller BSC is connected via an A sub interface to a transcoding and rate adaptation unit TRAU, which is connected to a mobile switching center MSC via an A interface.
  • the mobile switching center MSC represents the connection to other networks, for example to the fixed network. Circuit-switched data are transmitted via the A to interface, the A sub interface and the A interface.
  • the base station subsystem BSS which is formed from the base station BTS and base station controller BSC
  • a packet data control unit PCU which can be attached to the base station controller BSC, for example.
  • the packet data control unit PCU is responsible for the transmission of packet-switched data and is connected on the one hand to the base station via the A bis interface and on the other hand, for example via a G b interface, to a packet data service node SGSN, via which a connection to a packet data network, for example the IP network.
  • Packet data channels PDCH are set up on the radio interface U m , via which packet-switched data transmission is implemented.
  • modulation and coding schemes are available in the GPRS system and in the EDGE system for packet-switched data transmission, which differ in terms of their error protection. Modulation / coding schemes that ensure high error protection are associated with a lower data transmission rate, modulation / coding schemes that offer low error protection are associated with a higher data transmission rate.
  • a connection from the packet data control unit PCU is assigned a suitable modulation / coding scheme. The data rate actually achieved depends on the one hand on the modulation / coding scheme used and on the other hand on the number of retransmission rates required and is determined on the basis of radio planning tables or measurements.
  • N max the number of packet data channels K to which N packet-switched data transmissions from N subscribers are to be allocated.
  • Each packet data channel can be assigned more than one participant, but not more than a maximum number N max .
  • a subscriber can use elements on more than one packet data channel assigned if the subscriber's terminal is able to transmit on several channels at the same time or received. This property is called multislot capability designated. In today's GSM systems, it is common that in this case the participant elements on related Channels, that is channels with consecutive numbering be assigned to.
  • a subscriber i When establishing a connection, a subscriber i requests a target data rate R i * , which should be achieved as far as possible. The subscriber i also specifies a minimum data rate Ri min which should not be undercut for the data transmission. Examples of this are video streams in which a transmission no longer makes sense if a minimum rate cannot be guaranteed. In fact, the subscriber receives the data rate R i , which depends on the transmission properties of the radio channel, the load on the network and the resources allocated to the subscriber. The physical propagation conditions such as the distance between the mobile terminal and the base station, shadowing effects or the interference situation, and the applicable modulation / coding schemes are taken into account.
  • the data rate R i actually achieved thus depends on the assigned modulation / coding scheme C. It also depends on the proportion p i, j that the subscriber i receives on channel j due to the assignment.
  • the following applies 0 ⁇ p i, j ⁇ 1, (1 ⁇ i ⁇ N , 1 ⁇ j ⁇ K ) means that the subscriber i has been assigned a share p i, j on the packet data channel j.
  • the actual data rate for the subscriber is i
  • the actual data rate R i will be greater than, equal to or less than the target data rate R * / i required by the subscriber i.
  • the allocation matrix (p i, j ), which is the benefit U i for all participants, is determined with the method for the allocation of resources i ⁇ ⁇ 1, ..., N ⁇ optimized. Since it is not possible to increase the benefit U i for one participant i without reducing the benefit U k for all other participants k, the benefit of all participants is defined and optimized.
  • V of the optimal allocation matrix (p i, j ) is defined as follows
  • the number of time slots on which the mobile terminal can send or receive is generally less than the number k of packet data channels PDCH. Furthermore, the same packet data channel PDCH can only be assigned to a limited number of N max subscribers. Finally, only a limited number of time slots are available on the A to interface, so that not every modulation / coding scheme may be applicable. The applicable modulation / coding schemes depend on the current assignment of the A to time slots to the packet data channels and on the number of currently unused A to channels.
  • N subscribers are already allocated to the available packet data channels PDCH and a new connection is to be set up for a new subscriber N + 1, appropriate boundary conditions are first used to ensure that the already allocated subscribers keep their current assignment to the packet data channels. If a participant i is allocated on the packet data channels (j 1 ... to j M ), then p i, j ⁇ 0 For j ⁇ ⁇ j 1 , ..., j M ⁇ committed. When looking for packet data channels for the new subscriber N + 1 p N +1, j ⁇ 0 for all j ⁇ ⁇ j 1 , ..., j M ⁇ committed to prevent subscriber N + 1 from being allocated on another packet data channel.
  • Assignments that appear reasonable are examined. As Assignments that appear reasonable become combinations of Packet data channels considered, their number of timeslot capability of the mobile device and the successive Packet data channels are arranged. Is the number k of packet data channels 6, the time slot capability of the mobile terminal 4, there are only the three alternatives ⁇ 0,1,2,3 ⁇ , ⁇ 1,2,3,4 ⁇ , ⁇ 2,3,4,5 ⁇ . For these three alternatives the allocation is calculated. Below is the resulting values V of the assignment matrix selected the largest. With this approach, an assignment may which would involve a greater redistribution of the channels and may not be the real optimum being found. For this, the number of linear Optimizations that have to be calculated are limited. This saves processor performance.
  • the allocation matrix (p ij ), the number of assigned A bis channels (A j ) and the selected modulation / coding scheme CS for the subscriber N + 1 are determined.
  • the best available modulation / coding scheme CS must be calculated based on the number of available A bis channels and the vector S c . This is the modulation / coding scheme with the highest data rate for which sufficient A bis channels have already been assigned corresponding packet data channels or sufficient A bis channels are freely available.
  • the matrices and vectors are then built up for the given modulation / coding scheme, which are input variables for the linear optimization.
  • a transceiver unit of a base station with 6 packet data channels ⁇ 0,1,2,3,4,5 ⁇ is considered. At the beginning, all packet data channels are empty. It is assumed that the maximum number of participants to whom a packet data channel can be assigned is 8. The lower limit for the shares (p i, j ) is therefore 1/8 if the subscriber i is allocated to the packet data channel j. It is assumed that 26 A bis channels are available on the A bis interface. None of the A bis channels is allocated.
  • the successive arrival of participants 1, 2 and 3 is considered.
  • the properties of participants 1, 2 and 3 are shown in Table 1.
  • Participant 1 Participant 2 Participant 3 Signal to interference ratio C / I 15 dB 20 dB 30 dB
  • MCS-1 8.4Kbit / s 8.8Kbit / s 8.8Kbit / s 1 MCS-2 10.6 11.1 11.2 2 MCS-3 13.7 14.6 14.8 2 MCS-4 15.4 17.0 17.6 2 MCS-5 18.1 21.6 22.4 2 MCS-6 24.5 27.2 29.6 3 MCS-7 24.3 35.9 44.5 4 MCS-8 22.6 39.7 53.6 5 CS-9 19.2 38.2 57.6 5
  • Target data rate 64 kbps 111 kbps 80 kbps Minimum data rate 16 kbps 32 kbps 16 kbps
  • the table shows the signal-to-interference ratio, the data rates for a given modulation / coding scheme, the ability of the mobile terminal to send and receive simultaneously on different time slots, ie the mobile timeslot capability, the target data rate and the minimum data rate.
  • the number of A to channels per packet data channel A to TS is also specified by TDCH.
  • step 1 When participant 1 arrives, a check is carried out to determine what possible resources are available (see FIG. 2, step 1).
  • the best modulation and coding scheme for subscriber 1 is MCS-6. This enables subscriber 1 to achieve up to 24.5 Kbit / s on each of the packet data channels.
  • MSC-8 is the modulation / coding scheme in which the highest data rate of 39.7 Kbit / s can be achieved on each packet data channel if subscriber 2 does not have to share the packet data channels with another user.
  • the MCS8 modulation / coding scheme requires 5 A to channels for each packet data channel. For participant 2, there are thus four alternatives of assignment. Sufficient A to channels are available to assign the best modulation / coding scheme to subscriber 2.
  • the maximum that is achieved with alternative 4 is determined (see step 3 in FIG. 2). Therefore, resources 2 are assigned to subscriber 2 in accordance with alternative 4 (see step 4 in FIG. 2).
  • a further connection for subscriber 3 is subsequently established.
  • the initial situation is that only two free A to channels are available.
  • the best modulation / coding scheme would be MCS-9, with which a maximum data rate of 57.6 Kbit / s can be achieved.
  • subscriber 3 can only receive the modulation / coding scheme MCS-9 on the packet data channels ⁇ 2,3,4,5 ⁇ .
  • MCS-7 or lower coding schemes is possible, in which 4 A to channels are required per packet data channel.
  • the assignment matrix P i , the A to -assignment vector A i and the value V i are then determined for the assignment alternatives found.
  • V3 is the largest value, so that resources are allocated for subscriber 3 in accordance with alternative 3.
  • matrix p is recalculated. It now only has two lines, the first line corresponding to subscriber 2 and the second line corresponding to subscriber 3. It follows
  • Packet data channels 0 and 1 are no longer used.
  • the subscriber 2 would have to be shifted to the packet data channels 0, 1, 2 using a heuristic method outside the described method.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Mobile Radio Communication Systems (AREA)
EP03004530A 2003-02-28 2003-02-28 Procédé d'attribution de ressources radio pour une transmission de données dans un système de radiocommunication Withdrawn EP1453339A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP03004530A EP1453339A1 (fr) 2003-02-28 2003-02-28 Procédé d'attribution de ressources radio pour une transmission de données dans un système de radiocommunication
EP04703793A EP1597930B1 (fr) 2003-02-28 2004-01-21 Procede d'affectation de ressources radiotechniques pour une transmission de donnees dans un systeme de radiocommunication
PCT/EP2004/000466 WO2004077866A1 (fr) 2003-02-28 2004-01-21 Procede d'affectation de ressources radiotechniques pour une transmission de donnees dans un systeme de radiocommunication
DE502004001672T DE502004001672D1 (de) 2003-02-28 2004-01-21 Verfahren zur zuweisung funktechnischer ressourcen für eine datenübertragung in einem funkkommunikationssystem
US10/541,707 US7382745B2 (en) 2003-02-28 2004-01-21 Method for allocating radio technical resources for data transmission in a radio communication network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03004530A EP1453339A1 (fr) 2003-02-28 2003-02-28 Procédé d'attribution de ressources radio pour une transmission de données dans un système de radiocommunication

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EP03004530A Withdrawn EP1453339A1 (fr) 2003-02-28 2003-02-28 Procédé d'attribution de ressources radio pour une transmission de données dans un système de radiocommunication

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2683184A1 (fr) * 2012-07-06 2014-01-08 Telefónica Germany GmbH & Co. OHG Procédé de transfert de données et système de communication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1154663A1 (fr) * 2000-05-09 2001-11-14 Lucent Technologies Inc. Contrôle de qualité de service ameliore dans un réseau de télécommunications
DE10029427A1 (de) * 2000-06-15 2001-12-20 Siemens Ag Verfahren zur Leistungsregelung und Kanalzuweisung in Abwärts- und/oder Aufwärtsverbindungen bei Paket-Daten-Diensten in einem Funk-Kommunikationssystem und Funk-Kommunikationssystem zum Durchführen des Verfahrens
US20020003783A1 (en) * 1999-09-28 2002-01-10 Kari Niemela Allocating abis interface transmission channels in packet cellular radio network
US6374112B1 (en) * 1998-04-03 2002-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Flexible radio access and resource allocation in a universal mobile telephone system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6374112B1 (en) * 1998-04-03 2002-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Flexible radio access and resource allocation in a universal mobile telephone system
US20020003783A1 (en) * 1999-09-28 2002-01-10 Kari Niemela Allocating abis interface transmission channels in packet cellular radio network
EP1154663A1 (fr) * 2000-05-09 2001-11-14 Lucent Technologies Inc. Contrôle de qualité de service ameliore dans un réseau de télécommunications
DE10029427A1 (de) * 2000-06-15 2001-12-20 Siemens Ag Verfahren zur Leistungsregelung und Kanalzuweisung in Abwärts- und/oder Aufwärtsverbindungen bei Paket-Daten-Diensten in einem Funk-Kommunikationssystem und Funk-Kommunikationssystem zum Durchführen des Verfahrens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2683184A1 (fr) * 2012-07-06 2014-01-08 Telefónica Germany GmbH & Co. OHG Procédé de transfert de données et système de communication

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